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Message-Id: <20071125215831.409C726F8C5@magilla.localdomain> Date: Sun, 25 Nov 2007 13:58:31 -0800 (PST) From: Roland McGrath <roland@...hat.com> To: Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org> Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com> Subject: [PATCH 02/27] x86: segment selector macros This copies into asm-x86/segment_64.h some macros from asm-x86/segment_32.h for dissecting segment selectors. This lets other code use these macros uniformly on 32/64-bit rather than duplicating the constants elsewhere. Signed-off-by: Roland McGrath <roland@...hat.com> --- include/asm-x86/segment_64.h | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/include/asm-x86/segment_64.h b/include/asm-x86/segment_64.h index 04b8ab2..dce7421 100644 --- a/include/asm-x86/segment_64.h +++ b/include/asm-x86/segment_64.h @@ -50,4 +50,15 @@ #define GDT_SIZE (GDT_ENTRIES * 8) #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) +/* Bottom two bits of selector give the ring privilege level */ +#define SEGMENT_RPL_MASK 0x3 +/* Bit 2 is table indicator (LDT/GDT) */ +#define SEGMENT_TI_MASK 0x4 + +/* User mode is privilege level 3 */ +#define USER_RPL 0x3 +/* LDT segment has TI set, GDT has it cleared */ +#define SEGMENT_LDT 0x4 +#define SEGMENT_GDT 0x0 + #endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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